import datetime
import operator
import re
from collections import UserString
from typing import Any
from typing import Callable
from typing import Dict
from typing import NamedTuple
from typing import Optional
from typing import Union

from xsdata.utils.dates import calculate_offset
from xsdata.utils.dates import calculate_timezone
from xsdata.utils.dates import format_date
from xsdata.utils.dates import format_offset
from xsdata.utils.dates import format_time
from xsdata.utils.dates import parse_date_args
from xsdata.utils.dates import validate_date
from xsdata.utils.dates import validate_time

xml_duration_re = re.compile(
    r"^([-]?)P"
    r"(?:(\d+)Y)?(?:(\d+)M)?(?:(\d+)D)?"
    r"(?:T(?:(\d+)H)?(?:(\d+)M)?(?:(\d+(.\d+)?)S)?)?$"
)

DS_YEAR = 31556926.0
DS_MONTH = 2629743
DS_DAY = 86400
DS_HOUR = 3600
DS_MINUTE = 60
DS_FRACTIONAL_SECOND = 0.000000001
DS_OFFSET = -60


class DateFormat:
    DATE = "%Y-%m-%d%z"
    TIME = "%H:%M:%S%z"
    DATE_TIME = "%Y-%m-%dT%H:%M:%S%z"
    G_DAY = "---%d%z"
    G_MONTH = "--%m%z"
    G_MONTH_DAY = "--%m-%d%z"
    G_YEAR = "%Y%z"
    G_YEAR_MONTH = "%Y-%m%z"


class XmlDate(NamedTuple):
    """
    Concrete xs:date builtin type.

    Represents iso 8601 date format [-]CCYY-MM-DD[Z|(+|-)hh:mm] with
    rich comparisons and hashing.

    :param year: Any signed integer, eg (0, -535, 2020)
    :param month: Unsigned integer between 1-12
    :param day: Unsigned integer between 1-31
    :param offset: Signed integer representing timezone offset in minutes
    """

    year: int
    month: int
    day: int
    offset: Optional[int] = None

    def replace(
        self,
        year: Optional[int] = None,
        month: Optional[int] = None,
        day: Optional[int] = None,
        offset: Optional[int] = True,
    ) -> "XmlDate":
        """Return a new instance replacing the specified fields with new
        values."""

        if year is None:
            year = self.year
        if month is None:
            month = self.month
        if day is None:
            day = self.day
        if offset is True:
            offset = self.offset

        return type(self)(year, month, day, offset)

    @classmethod
    def from_string(cls, string: str) -> "XmlDate":
        """Initialize from string with format ``%Y-%m-%dT%z``"""
        return cls(*parse_date_args(string, DateFormat.DATE))

    @classmethod
    def from_date(cls, obj: datetime.date) -> "XmlDate":
        """
        Initialize from :class:`datetime.date` instance.

        .. warning::

        date instances don't have timezone information!
        """
        return cls(obj.year, obj.month, obj.day)

    @classmethod
    def from_datetime(cls, obj: datetime.datetime) -> "XmlDate":
        """Initialize from :class:`datetime.datetime` instance."""
        return cls(obj.year, obj.month, obj.day, calculate_offset(obj))

    @classmethod
    def today(cls) -> "XmlDate":
        """Initialize from datetime.date.today()"""
        return cls.from_date(datetime.date.today())

    def to_date(self) -> datetime.date:
        """Return a :class:`datetime.date` instance."""
        return datetime.date(self.year, self.month, self.day)

    def to_datetime(self) -> datetime.datetime:
        """Return a :class:`datetime.datetime` instance."""
        tz_info = calculate_timezone(self.offset)
        return datetime.datetime(self.year, self.month, self.day, tzinfo=tz_info)

    def __str__(self) -> str:
        """
        Return the date formatted according to ISO 8601 for xml.

        Examples:
            - 2001-10-26
            - 2001-10-26+02:00
            - 2001-10-26Z
        """
        return format_date(self.year, self.month, self.day) + format_offset(self.offset)

    def __repr__(self) -> str:
        args = [self.year, self.month, self.day, self.offset]
        if args[-1] is None:
            del args[-1]

        return f"{self.__class__.__qualname__}({', '.join(map(str, args))})"


class XmlDateTime(NamedTuple):
    """
    Concrete xs:dateTime builtin type.

    Represents iso 8601 date time format [-]CCYY-MM-DDThh:mm:ss[Z|(+|-)hh:mm]
    with rich comparisons and hashing.

    :param year: Any signed integer, eg (0, -535, 2020)
    :param month: Unsigned integer between 1-12
    :param day: Unsigned integer between 1-31
    :param hour: Unsigned integer between 0-24
    :param minute: Unsigned integer between 0-59
    :param second: Unsigned integer between 0-59
    :param fractional_second: Unsigned integer between 0-999999999
    :param offset: Signed integer representing timezone offset in
        minutes
    """

    year: int
    month: int
    day: int
    hour: int
    minute: int
    second: int
    fractional_second: int = 0
    offset: Optional[int] = None

    @property
    def microsecond(self) -> int:
        return self.fractional_second // 1000

    @property
    def duration(self) -> float:
        if self.year < 0:
            negative = True
            year = -self.year
        else:
            negative = False
            year = self.year

        total = (
            year * DS_YEAR
            + self.month * DS_MONTH
            + self.day * DS_DAY
            + self.hour * DS_HOUR
            + self.minute * DS_MINUTE
            + self.second
            + self.fractional_second * DS_FRACTIONAL_SECOND
            + (self.offset or 0) * DS_OFFSET
        )
        return -total if negative else total

    @classmethod
    def from_string(cls, string: str) -> "XmlDateTime":
        """Initialize from string with format ``%Y-%m-%dT%H:%M:%S%z``"""
        (
            year,
            month,
            day,
            hour,
            minute,
            second,
            fractional_second,
            offset,
        ) = parse_date_args(string, DateFormat.DATE_TIME)
        validate_date(year, month, day)
        validate_time(hour, minute, second, fractional_second)

        return cls(year, month, day, hour, minute, second, fractional_second, offset)

    @classmethod
    def from_datetime(cls, obj: datetime.datetime) -> "XmlDateTime":
        """Initialize from :class:`datetime.datetime` instance."""
        return cls(
            obj.year,
            obj.month,
            obj.day,
            obj.hour,
            obj.minute,
            obj.second,
            obj.microsecond * 1000,
            calculate_offset(obj),
        )

    @classmethod
    def now(cls, tz: Optional[datetime.timezone] = None) -> "XmlDateTime":
        """Initialize from datetime.datetime.now()"""
        return cls.from_datetime(datetime.datetime.now(tz=tz))

    @classmethod
    def utcnow(cls) -> "XmlDateTime":
        """Initialize from datetime.datetime.utcnow()"""
        return cls.from_datetime(datetime.datetime.utcnow())

    def to_datetime(self) -> datetime.datetime:
        """Return a :class:`datetime.datetime` instance."""
        return datetime.datetime(
            self.year,
            self.month,
            self.day,
            self.hour,
            self.minute,
            self.second,
            self.microsecond,
            tzinfo=calculate_timezone(self.offset),
        )

    def replace(
        self,
        year: Optional[int] = None,
        month: Optional[int] = None,
        day: Optional[int] = None,
        hour: Optional[int] = None,
        minute: Optional[int] = None,
        second: Optional[int] = None,
        fractional_second: Optional[int] = None,
        offset: Optional[int] = True,
    ) -> "XmlDateTime":
        """Return a new instance replacing the specified fields with new
        values."""

        if year is None:
            year = self.year
        if month is None:
            month = self.month
        if day is None:
            day = self.day
        if hour is None:
            hour = self.hour
        if minute is None:
            minute = self.minute
        if second is None:
            second = self.second
        if fractional_second is None:
            fractional_second = self.fractional_second
        if offset is True:
            offset = self.offset

        return type(self)(
            year, month, day, hour, minute, second, fractional_second, offset
        )

    def __str__(self) -> str:
        """
        Return the datetime formatted according to ISO 8601 for xml.

        Examples:
            - 2001-10-26T21:32:52
            - 2001-10-26T21:32:52+02:00
            - 2001-10-26T19:32:52Z
            - 2001-10-26T19:32:52.126789
            - 2001-10-26T21:32:52.126
            - -2001-10-26T21:32:52.126Z
        """
        return "{}T{}{}".format(
            format_date(self.year, self.month, self.day),
            format_time(self.hour, self.minute, self.second, self.fractional_second),
            format_offset(self.offset),
        )

    def __repr__(self) -> str:
        args = tuple(self)
        if args[-1] is None:
            args = args[:-1]

            if args[-1] == 0:
                args = args[:-1]

        return f"{self.__class__.__qualname__}({', '.join(map(str, args))})"

    def __eq__(self, other: Any) -> bool:
        return cmp(self, other, operator.eq)

    def __ne__(self, other: Any) -> bool:
        return cmp(self, other, operator.ne)

    def __lt__(self, other: Any) -> bool:
        return cmp(self, other, operator.lt)

    def __le__(self, other: Any) -> bool:
        return cmp(self, other, operator.le)

    def __gt__(self, other: Any) -> bool:
        return cmp(self, other, operator.gt)

    def __ge__(self, other: Any) -> bool:
        return cmp(self, other, operator.ge)


class XmlTime(NamedTuple):
    """
    Concrete xs:time builtin type.

    Represents iso 8601 time format hh:mm:ss[Z|(+|-)hh:mm]
    with rich comparisons and hashing.

    :param hour: Unsigned integer between 0-24
    :param minute: Unsigned integer between 0-59
    :param second: Unsigned integer between 0-59
    :param fractional_second: Unsigned integer between 0-999999999
    :param offset: Signed integer representing timezone offset in minutes
    """

    hour: int
    minute: int
    second: int
    fractional_second: int = 0
    offset: Optional[int] = None

    @property
    def microsecond(self) -> int:
        return self.fractional_second // 1000

    @property
    def duration(self) -> float:
        return (
            self.hour * DS_HOUR
            + self.minute * DS_MINUTE
            + self.second
            + self.fractional_second * DS_FRACTIONAL_SECOND
            + (self.offset or 0) * DS_OFFSET
        )

    def replace(
        self,
        hour: Optional[int] = None,
        minute: Optional[int] = None,
        second: Optional[int] = None,
        fractional_second: Optional[int] = None,
        offset: Optional[int] = True,
    ) -> "XmlTime":
        """Return a new instance replacing the specified fields with new
        values."""

        if hour is None:
            hour = self.hour
        if minute is None:
            minute = self.minute
        if second is None:
            second = self.second
        if fractional_second is None:
            fractional_second = self.fractional_second
        if offset is True:
            offset = self.offset

        return type(self)(hour, minute, second, fractional_second, offset)

    @classmethod
    def from_string(cls, string: str) -> "XmlTime":
        """Initialize from string format ``%H:%M:%S%z``"""
        hour, minute, second, fractional_second, offset = parse_date_args(
            string, DateFormat.TIME
        )
        validate_time(hour, minute, second, fractional_second)
        return cls(hour, minute, second, fractional_second, offset)

    @classmethod
    def from_time(cls, obj: datetime.time) -> "XmlTime":
        """Initialize from :class:`datetime.time` instance."""
        return cls(
            obj.hour,
            obj.minute,
            obj.second,
            obj.microsecond * 1000,
            calculate_offset(obj),
        )

    @classmethod
    def now(cls, tz: Optional[datetime.timezone] = None) -> "XmlTime":
        """Initialize from datetime.datetime.now()"""
        return cls.from_time(datetime.datetime.now(tz=tz).time())

    @classmethod
    def utcnow(cls) -> "XmlTime":
        """Initialize from datetime.datetime.utcnow()"""
        return cls.from_time(datetime.datetime.utcnow().time())

    def to_time(self) -> datetime.time:
        """Return a :class:`datetime.time` instance."""
        return datetime.time(
            self.hour,
            self.minute,
            self.second,
            self.microsecond,
            tzinfo=calculate_timezone(self.offset),
        )

    def __str__(self) -> str:
        """
        Return the time formatted according to ISO 8601 for xml.

        Examples:
            - 21:32:52
            - 21:32:52+02:00,
            - 19:32:52Z
            - 21:32:52.126789
            - 21:32:52.126Z
        """
        return "{}{}".format(
            format_time(self.hour, self.minute, self.second, self.fractional_second),
            format_offset(self.offset),
        )

    def __repr__(self) -> str:
        args = list(self)
        if args[-1] is None:
            del args[-1]

        return f"{self.__class__.__qualname__}({', '.join(map(str, args))})"

    def __eq__(self, other: Any) -> bool:
        return cmp(self, other, operator.eq)

    def __ne__(self, other: Any) -> bool:
        return cmp(self, other, operator.ne)

    def __lt__(self, other: Any) -> bool:
        return cmp(self, other, operator.lt)

    def __le__(self, other: Any) -> bool:
        return cmp(self, other, operator.le)

    def __gt__(self, other: Any) -> bool:
        return cmp(self, other, operator.gt)

    def __ge__(self, other: Any) -> bool:
        return cmp(self, other, operator.ge)


DurationType = Union[XmlTime, XmlDateTime]


def cmp(a: DurationType, b: DurationType, op: Callable) -> bool:
    if isinstance(b, a.__class__):
        return op(a.duration, b.duration)

    return NotImplemented


class TimeInterval(NamedTuple):
    negative: bool
    years: Optional[int]
    months: Optional[int]
    days: Optional[int]
    hours: Optional[int]
    minutes: Optional[int]
    seconds: Optional[float]


class XmlDuration(UserString):
    """
    Concrete xs:duration builtin type.

    Represents iso 8601 duration format PnYnMnDTnHnMnS
    with rich comparisons and hashing.

    Format PnYnMnDTnHnMnS:
        - **P**: literal value that starts the expression
        - **nY**: the number of years followed by a literal Y
        - **nM**: the number of months followed by a literal M
        - **nD**: the number of days followed by a literal D
        - **T**: literal value that separates date and time parts
        - **nH**: the number of hours followed by a literal H
        - **nM**: the number of minutes followed by a literal M
        - **nS**: the number of seconds followed by a literal S

    :param value: String representation of a xs:duration, eg **P2Y6M5DT12H**
    """

    def __init__(self, value: str) -> None:
        super().__init__(value)
        self._interval = self._parse_interval(value)

    @property
    def years(self) -> Optional[int]:
        """Number of years in the interval."""
        return self._interval.years

    @property
    def months(self) -> Optional[int]:
        """Number of months in the interval."""
        return self._interval.months

    @property
    def days(self) -> Optional[int]:
        """Number of days in the interval."""
        return self._interval.days

    @property
    def hours(self) -> Optional[int]:
        """Number of hours in the interval."""
        return self._interval.hours

    @property
    def minutes(self) -> Optional[int]:
        """Number of minutes in the interval."""
        return self._interval.minutes

    @property
    def seconds(self) -> Optional[float]:
        """Number of seconds in the interval."""
        return self._interval.seconds

    @property
    def negative(self) -> bool:
        """Negative flag of the interval."""
        return self._interval.negative

    @classmethod
    def _parse_interval(cls, value: str) -> TimeInterval:
        if not isinstance(value, str):
            raise ValueError("Value must be string")

        if len(value) < 3 or value.endswith("T"):
            raise ValueError(f"Invalid format '{value}'")

        match = xml_duration_re.match(value)
        if not match:
            raise ValueError(f"Invalid format '{value}'")

        sign, years, months, days, hours, minutes, seconds, _ = match.groups()
        return TimeInterval(
            negative=sign == "-",
            years=int(years) if years else None,
            months=int(months) if months else None,
            days=int(days) if days else None,
            hours=int(hours) if hours else None,
            minutes=int(minutes) if minutes else None,
            seconds=float(seconds) if seconds else None,
        )

    def asdict(self) -> Dict:
        return self._interval._asdict()

    def __repr__(self) -> str:
        return f'{self.__class__.__qualname__}("{self.data}")'


class TimePeriod(NamedTuple):
    year: Optional[int]
    month: Optional[int]
    day: Optional[int]
    offset: Optional[int]


class XmlPeriod(UserString):
    """
    Concrete xs:gYear/Month/Day builtin type.

    Represents iso 8601 period formats with rich comparisons and hashing.

    Formats:
        - xs:gDay: **---%d%z**
        - xs:gMonth: **--%m%z**
        - xs:gYear: **%Y%z**
        - xs:gMonthDay: **--%m-%d%z**
        - xs:gYearMonth: **%Y-%m%z**

    :param value: String representation of a xs:period, eg **--11-01Z**
    """

    def __init__(self, value: str) -> None:
        value = value.strip()
        super().__init__(value)
        self._period = self._parse_period(value)

    @property
    def year(self) -> Optional[int]:
        """Period year."""
        return self._period.year

    @property
    def month(self) -> Optional[int]:
        """Period month."""
        return self._period.month

    @property
    def day(self) -> Optional[int]:
        """Period day."""
        return self._period.day

    @property
    def offset(self) -> Optional[int]:
        """Period timezone offset in minutes."""
        return self._period.offset

    @classmethod
    def _parse_period(cls, value: str) -> TimePeriod:
        year = month = day = offset = None
        if value.startswith("---"):
            day, offset = parse_date_args(value, DateFormat.G_DAY)
        elif value.startswith("--"):
            # Bogus format --MM--, --05---05:00
            if value[4:6] == "--":
                value = value[:4] + value[6:]

            if len(value) in (4, 5, 10):  # fixed lengths with/out timezone
                month, offset = parse_date_args(value, DateFormat.G_MONTH)
            else:
                month, day, offset = parse_date_args(value, DateFormat.G_MONTH_DAY)
        else:
            end = len(value)
            if value.find(":") > -1:  # offset
                end -= 6

            if value[:end].rfind("-") > 3:  # Minimum position for month sep
                year, month, offset = parse_date_args(value, DateFormat.G_YEAR_MONTH)
            else:
                year, offset = parse_date_args(value, DateFormat.G_YEAR)

        validate_date(0, month or 1, day or 1)

        return TimePeriod(year=year, month=month, day=day, offset=offset)

    def as_dict(self) -> Dict:
        """Return date units as dict."""
        return self._period._asdict()

    def __repr__(self) -> str:
        return f'{self.__class__.__qualname__}("{self.data}")'

    def __eq__(self, other: Any) -> bool:
        if isinstance(other, XmlPeriod):
            return self._period == other._period

        return NotImplemented


class XmlHexBinary(bytes):
    """
    Subclass bytes to infer base16 format.

    This type can be used with xs:anyType fields that don't have a
    format property to specify the target output format.
    """


class XmlBase64Binary(bytes):
    """
    Subclass bytes to infer base64 format.

    This type can be used with xs:anyType fields that don't have a
    format property to specify the target output format.
    """
